Blast-furnace.



J. RBIS.

BLAST FURNACE.

APPLICATION FILED SEPT. 15, 1911.

1,086,220. Patented Feb. 3, 1914.

2 SHEETS-SHEET 1.

INVENTOR B Alforneys,

COLUMBIA PLANOGRAFH (20.. WASHINGTON. D. c.

J. REIS.)

BLAST FURNACE.

APPLICATION FILED SEPT. 15,1911.

1,086,220. Patented Feb. 3, 1914.

2 SHEETS-11331 2.

NVENTOR By A ltlWne /s,

COLUMBIA nuNouR/wn CO..\\'A5HINGTON. n. c.

JOHN REIS, 0F MONTCLAIR, NEW JERSEY.

BLAST-FURNACE.

Specification of Letters Patent.

PatentedFeb. 3,1914.

Application filed September 15, 1911. Serial No. 649,426.

I To all whom it may concern Be it known that I, JOHN Rnrs, a citizen of the United States, residing in Montclair, New Jersey, have invented certain new and useful Improvements in Blast-Furnaces, of-

which the following is a specification.

Heretofore much trouble has been experienced in blast furnace practice by materials in the furnace being carried over in the gas escaping therefrom and depositing in the gas mains. This usually occurs when there is a sudden settlement of the stock in the furnace or when there is an explosion, either of which will cause the materials in the furnace (ore, coke and limestone in the case of iron furnaces) to be thrown out of the furnace into the gas. outlets and carried down the gas downt-ake pipe, commonly called the downcomer, and deposited in the receptacle provided at the bottom of the downcomer, commonly called the dust catcher, some of it even being carried over into the gas distributingsystem.

The present invent-ion aims to prevent the larger pieces of material from being thrown out of the furnace in this manner. For this purpose a screen is used in suitable position relatively to the gas outlet from the furnace. In the type of furnace commonly used for treating iron ores the upper end of the shaft is normally closed and a gas outlet or outlets are provided through the side near the top. A bell and hopper are used to close the top, the bell being lowered when a new supply of material is introduced.

The drawings illustrate embodiments of the invention particularly applicable to this type of furnace.

Figure 1 is a vertical diametral section of the upper part of the furnace on the line 1-1 of Fig. 2. Fig. 2 is a partial horizontal section thereof on the line 22 of Fig. 1. Fig. 3 is a vertical section on the line 3-3 of Fig. 2. Fig. 4 is a section similar to Fig. 1 showing another construction embodying the invention.

Referring now to the embodiments of the invention herein, A is the shaft of the furnace comprising a metal shell lined with brick work.

B is the lining of the upper end comprising a ring of cast iron having openings C leading to the gas discharge pipes D. On the top of the furnace is a hopper Eresting on the upper end of the furnace by means of a flange F so that it can be readily removed. In the lower end of the hopper is a bell G normally raised to close the bottom of the hopper and adapted to be lowered in introducing material. In the path of the gases to the outlets there is provided an annular screen substantially covering the space between the hopper and the Wall of the furnace at a point below the discharge outlet, this screen being indicated as a whole by the letter H. The screen may be a ring of metal cast with perforations of suitable size and spacing. In Figs. 1, 2 and 3 such a ring is shown having legs J at intervals resting on brackets K on the inner face of the cast iron lining ring B. Between the points of support of the screen its lower edge is spaced apart from the lining of the furnace, as shown in Fig. 2 sufficiently to allow any particles to pass from above the screen down into the furnace The upper part of the screen may be made in the form of a cylinder L, the wall of which is located about half way between the lining of the furnace and the lower edge of the hopper. This portion L of the screen serves to distribute properly in the furnace the material which runs out of the bottom of the hopper when the bell is lowered; in the manner of the Killeen distributor, which is well known in the art. Above the distributing portion L of the screen is a portion M extending to a point close to the hopper so as to make the screen as awhole extend completely over the path of the gases.

In the construction shown in Fig. 4 the screen H is of approximately the same form as in Fig. 1, but is differently supported. It extends upward along the underside of the hopper E and is provided on its upper edge with a flange N which rests on a suitable shoulder 0 provided for this purpose near the upper edge of the furnace. The portion of the screen marked L corresponds with the part L of Fig. 1; that is to say it serves as adistributer for the material. It is perforated, however, (above the base of the bell G) to increase the total area of the gas passages through the screen. The lower edge of the screen clears the lining B of the furnace all around. In order to secure a sufliciently accurate spacing between the lower edge of the screen and the lining B the latter is cast with a chipping strip P. Inaccuracies in the castings can then be remedied by chipping off parts of the strip P at one point or another so as to secure the desired clearance between the screen and the lining at all points.

In each of the constructions shown the screen is removable; being in fact merely supported on projecting portions of the furnace wall so as to permit its easy removal through the upper end of the furnace. It is not necessary, for this purpose, to have a man enter the furnace. It it only necessary to first lift out the hopper and bell, whereupon the screen can be lifted directly out of the upper end of the furnace. This is important because workmen going into the furnace would be exposed to poisonous gases and would have to work in very difficult situations. The screens are as easily replaced as they are removed.

The loose method of supporting the screens has also the advantage that it is independent of the hopper and is not disturbed by expansion of the hopper, screen, or furnace lining.

hat I claim is:

1. A blast furnace having a hopper, a gas outlet and a screen covering the space be tween the hopper and the wall of the furnace and located in the path of the gases to said outlet, a portion of said screen forming a stock distributer.

2. A. blast furnace having a wall with projecting portions and having a gas outlet near the top and a screen for preventing large pieces of solid material from being discharged through said gas outlet, said screen being merely supported on projecting portions of the furnace wall so as to permit its easy removal through the upper end of the furnace.

3. A blast furnace having a hopper at the upper end, a gas outlet through the side near the top, and an annular screen covering the space between the hopper and the wall of the furnace and supported independently of the hopper and with freedom for expansion.

4. A blast furnace having a hopper at the upper end, a gas outlet through the side near the top, and an annular screen covering the space between the hopper and the wall of the furnace, the lining of the furnace having supporting shoulders and the screen having parts resting on said shoulders whereby the screen is supported in position with freedom of removal and replacement without the necessity of entering the furnace.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

JOHN REIS. lVitnesses:

M. A. NEELUND, A. L. MGKIBBIN.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of latente. Washington, D. C. 

